# Fiduciary Duty **The model:** A legal obligation to act in the interest of another party (the principal or beneficiary) rather than in one's own interest. The duty applies in many relationships: trustees to beneficiaries, corporate directors to shareholders, lawyers to clients, doctors to patients, investment advisors to investors. Fiduciaries are held to a higher standard than ordinary contract parties — they must act with loyalty, prudence, and disclosure, with conflicts of interest minimized or fully disclosed. The mental-model importance is the *principal-agent problem* it addresses. Wherever one party (the agent) acts on behalf of another (the principal), there's potential for the agent to serve their own interest rather than the principal's. Fiduciary duty is the legal-ethical framework that constrains this. Where fiduciary duty applies, the framework provides clear obligations; where it doesn't, agents face only contract-level obligations and conflicts of interest are routine. ## KB Applications ### The Trump-Era Erosion of Fiduciary Norms A diagnostic pattern of the contemporary administration: the systematic weakening of fiduciary obligations in government roles. Civil servants face pressure to serve political allies rather than the public interest. Inspectors general (whose duty is to the public, not to the President) have been fired. Department of Justice prosecutorial decisions track political alignment rather than legal merit. Each instance violates implicit fiduciary norms; the cumulative pattern is a shift from fiduciary-duty governance to political-loyalty governance. ### Why Investment-Advisor Fiduciary Standards Matter A specific recent example: the SEC's "Regulation Best Interest" (2019) replaced the proposed "fiduciary duty" rule for investment advisors with a weaker "best interest" standard. The technical distinction has substantial practical effects: under fiduciary duty, advisors must act in clients' interests; under "best interest," advisors must merely consider clients' interests. The rule change benefited brokers (who can recommend products that generate commissions) at the expense of investors. The regulatory debate is mostly invisible to most voters but quantitatively important. ### The Public-Trust Tradition A broader frame: many government roles can be understood as fiduciary relationships even when not formally so labeled. Elected officials hold public trust on behalf of constituents; judges hold judicial power on behalf of the rule of law; civil servants hold administrative authority on behalf of statutory mandates. Erosion of these implicit fiduciary norms — through corruption, capture, or open self-dealing — is one of the structural features of democratic decline. ## See Also - [[Skin in the Game]] — Taleb's framework that complements fiduciary obligation - [[Moral Hazard]] — what fiduciary duty constrains - [[Adverse Selection]] — the closely-related contract-theory problem